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#![forbid(unsafe_code)]
use crate::types::*;
use smol::prelude::*;
use crate::encoding;
use smol::{ unblock, Unblock };
use smol::io::{ BoxedReader, BoxedWriter };
use smol::lock::{ OnceCell, RwLock };
use std::fmt::Display;
use std::os::fd::AsRawFd;
use termios::Termios;
pub struct Terminal {
pub stdin: BoxedReader,
pub stdout: BoxedWriter,
pub initial_termios: OnceCell<Termios>,
pub width: RwLock<usize>,
pub height: RwLock<usize>,
}
pub enum EscapeType {
CSI,
CSIPrivate,
}
impl Terminal {
pub async fn new() -> Self {
Terminal {
stdin: Unblock::new(std::io::stdin()).boxed_reader(),
stdout: Unblock::new(std::io::stdout()).boxed_writer(),
initial_termios: OnceCell::new(),
width: RwLock::new(80),
height: RwLock::new(24),
}
}
pub async fn init_termios(&mut self) -> Result<()> {
let _ = self.initial_termios.set(unblock(|| {
let fd = std::io::stdin().as_raw_fd();
Termios::from_fd(fd)
}).await?).await;
let mut termios = self.initial_termios.get().unwrap().clone();
termios.c_lflag &= !(termios::ECHO
| termios::ECHONL
| termios::os::linux::ECHOCTL
| termios::ICANON);
termios.c_lflag |= termios::ISIG;
termios.c_cc[termios::VMIN] = 1;
termios.c_cc[termios::VTIME] = 0;
unblock(move || {
let fd = std::io::stdin().as_raw_fd();
termios::tcsetattr(fd, termios::TCSANOW, &mut termios)
}).await?;
Ok(())
}
pub async fn zap_termios(&mut self) -> Result<()> {
let mut termios = self.initial_termios.get().unwrap().clone();
unblock(move || {
let fd = std::io::stdin().as_raw_fd();
termios::tcsetattr(fd, termios::TCSANOW, &mut termios)
}).await?;
Ok(())
}
pub async fn init_full_screen(&mut self) -> Result<()> {
self.do_start_alternate_screen().await?;
self.do_cursor_position(0, 0).await?;
let (width, height) = self.do_report_size().await?;
*self.width.write().await = width.try_into().unwrap();
*self.height.write().await = height.try_into().unwrap();
Ok(())
}
pub async fn zap_full_screen(&mut self) -> Result<()> {
self.do_end_alternate_screen().await?;
self.stdout.flush().await?;
Ok(())
}
pub async fn read_char(&mut self) -> Result<char> {
encoding::read_utf8_char(&mut self.stdin).await
}
pub async fn do_escape(&mut self, escape_type: EscapeType, code: &str,
parameters: &[impl Display])
-> Result<()>
{
self.stdout.write_all(escape_type.intro().as_bytes()).await?;
for (index, parameter) in parameters.iter().enumerate() {
self.stdout.write_all(if index < parameters.len() - 1 {
format!("{};", parameter)
} else {
format!("{}{}", parameter, code)
}.as_bytes()).await?;
}
Ok(())
}
pub async fn read_report(&mut self, escape_type: EscapeType)
-> Result<(char, Vec<u64>)>
{
let mut expected = escape_type.intro();
while expected.len() > 0 {
let mut buf = vec![0; 1];
self.stdin.read_exact(&mut buf).await?;
expected = &expected[1..];
}
let mut values = Vec::new();
let mut number: u64 = 0;
let mut in_number = false;
let mut after_semicolon = false;
let mut buf = vec![0; 1];
self.stdin.read_exact(&mut buf).await?;
loop {
if let Ok(string) = std::str::from_utf8(&buf)
&& let Some(c) = string.chars().next()
{
if c.is_ascii_digit() {
if in_number {
number = number * 10
+ <u32 as Into<u64>>::into(c.to_digit(10).unwrap());
} else {
number = c.to_digit(10).unwrap().into();
in_number = true;
after_semicolon = false;
}
} else if c == ';' {
if in_number {
values.push(number);
in_number = false;
after_semicolon = true;
} else {
break;
}
} else if c.is_ascii_alphabetic() {
if in_number {
values.push(number);
} else if after_semicolon {
break;
}
return Ok((c, values))
} else {
break;
}
} else {
break;
}
self.stdin.read_exact(&mut buf).await?;
}
Err(std::io::Error::other("Invalid report from terminal."))
}
// xterm
pub async fn do_start_alternate_screen(&mut self) -> Result<()> {
self.do_escape(EscapeType::CSIPrivate, "h", &[1049]).await
}
// xterm
pub async fn do_end_alternate_screen(&mut self) -> Result<()> {
self.do_escape(EscapeType::CSIPrivate, "l", &[1049]).await
}
// vt220? vt100?
pub async fn do_cursor_position(&mut self, x: usize, y: usize)
-> Result<()>
{
self.do_escape(EscapeType::CSI, "H", &[y + 1, x + 1]).await
}
// dtterm? xterm
pub async fn do_report_size(&mut self) -> Result<(u64, u64)> {
self.do_escape(EscapeType::CSI, "t", &[18]).await?;
self.stdout.flush().await?;
let (code, values) = self.read_report(EscapeType::CSI).await?;
if code == 't' && values.len() == 3 && values[0] == 8 {
Ok((values[2], values[1]))
} else {
Err(std::io::Error::other("Couldn't read terminal size."))
}
}
// vt100
pub async fn clear(&mut self) -> Result<()> {
self.do_escape(EscapeType::CSI, "J", &[2]).await
}
}
impl EscapeType {
fn intro(&self) -> &'static str {
match self {
EscapeType::CSI => "\x1b[",
EscapeType::CSIPrivate => "\x1b[?",
}
}
}
|